<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Coder-nav-404</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background-color: #f8f9fa;
            color: #343a40;
            line-height: 1.6;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
            text-align: center;
        }
        
        .container {
            max-width: 600px;
            width: 100%;
            animation: fadeIn 0.8s ease-out;
        }
        
        .error-code {
            font-size: 8rem;
            font-weight: 700;
            color: #6c757d;
            margin-bottom: 10px;
            line-height: 1;
        }
        
        .error-message {
            font-size: 1.1rem;
            margin-bottom: 30px;
            color: #6c757d;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        @media (max-width: 576px) {
            .error-code {
                font-size: 6rem;
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="error-code">404</div>
        <p class="error-message">抱歉，您要查找的页面不存在</p>
    </div>
    </div>

    <script>
        document.addEventListener('DOMContentLoaded', function() {
            // 添加404数字的轻微动画
            const errorCode = document.querySelector('.error-code');
            errorCode.style.opacity = '0';
            setTimeout(() => {
                errorCode.style.transition = 'opacity 0.5s ease';
                errorCode.style.opacity = '1';
            }, 300);
        });
    </script>
</body>
</html>